English verb conjugation
SHOULD PRESERVE

Regular verb: preserve - preserved - preserved

Affirmation

Simple form	V-ing form
I'd preserve you'd preserve he'd preserve we'd preserve you'd preserve they'd preserve	I'd be preserving you'd be preserving he'd be preserving we'd be preserving you'd be preserving they'd be preserving
Perfect	V-ing perfect
I should've preserved you should've preserved he should've preserved we should've preserved you should've preserved they should've preserved	I should've been preserving you should've been preserving he should've been preserving we should've been preserving you should've been preserving they should've been preserving

Negation

Simple form	V-ing form
I shouldn't preserve you shouldn't preserve he shouldn't preserve we shouldn't preserve you shouldn't preserve they shouldn't preserve	I shouldn't be preserving you shouldn't be preserving he shouldn't be preserving we shouldn't be preserving you shouldn't be preserving they shouldn't be preserving
Perfect	V-ing perfect
I shouldn't have preserved you shouldn't have preserved he shouldn't have preserved we shouldn't have preserved you shouldn't have preserved they shouldn't have preserved	I shouldn't have been preserving you shouldn't have been preserving he shouldn't have been preserving we shouldn't have been preserving you shouldn't have been preserving they shouldn't have been preserving

Interrogative form

Simple form	V-ing form
should I preserve? should you preserve? should he preserve? should we preserve? should you preserve? should they preserve?	should I be preserving? should you be preserving? should he be preserving? should we be preserving? should you be preserving? should they be preserving?
Perfect	V-ing perfect
should I have preserved? should you have preserved? should he have preserved? should we have preserved? should you have preserved? should they have preserved?	should I have been preserving? should you have been preserving? should he have been preserving? should we have been preserving? should you have been preserving? should they have been preserving?

Interro-negative form

Simple form	V-ing form
shouldn't I preserve? shouldn't you preserve? shouldn't he preserve? shouldn't we preserve? shouldn't you preserve? shouldn't they preserve?	shouldn't I be preserving? shouldn't you be preserving? shouldn't he be preserving? shouldn't we be preserving? shouldn't you be preserving? shouldn't they be preserving?
Perfect	V-ing perfect
shouldn't I have preserved? shouldn't you have preserved? shouldn't he have preserved? shouldn't we have preserved? shouldn't you have preserved? shouldn't they have preserved?	shouldn't I have been preserving? shouldn't you have been preserving? shouldn't he have been preserving? shouldn't we have been preserving? shouldn't you have been preserving? shouldn't they have been preserving?